Synthesis and visible down- and up-conversion emissions from Yb3+/Ho3+/ Tm3+ Co-Doped Y4Al2O9 (YAM) nanocrystalline particles

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dc.creatorGomes, Paulo F.
dc.creatorSilva, Tarcisio C.
dc.creatorMaia, Lauro June Queiroz
dc.creatorCarvalho, Jesiel Freitas
dc.date.accessioned2024-01-19T13:45:14Z
dc.date.available2024-01-19T13:45:14Z
dc.date.issued2020
dc.description.abstractWe studied Yb3+/Ho3+/Tm3+ co-doped Y4Al2O9 (YAM) crystalline phase prepared by a modified polymeric precursor method, involving pyrolytic treatment and a calcination at 1100 ◦C during 3 h. X-ray powder diffraction patterns and high-resolution transmission electron microscopy images revealed the formation of single monoclinic crystalline phase. The co-doped YAM phase presents an optical bandgap of 4.58 eV and high diffuse reflectance value in the visible region. Down- and up-conversions were observed and analyzed. Photoluminescence measurements showed three emission bands in the visible region: 471–486 nm (blue region), 536–548 nm (green region), and 638–665 (red region) from Tm3+ and Ho3+ ions. The CIE color coordinates of the up-conversion emissions under excitation at 980 nm were determined, demonstrating a yellowish emission color. Finally, the lifetimes of some Ho3+ and Tm3+ levels were determined, and an energy mechanism transfer is suggested for up-conversion processes.
dc.identifier.citationGOMES, Paulo F. et al. Synthesis and visible down- and up-conversion emissions from Yb3+/Ho3+/Tm3+ Co-Doped Y4Al2O9 (YAM) nanocrystalline particles. Journal of Luminescence, Amsterdam, v. 227, e117554, 2020. DOI: 10.1016/j.jlumin.2020.117554. DisponĂ­vel em: https://www.sciencedirect.com/science/article/pii/S0022231320309066. Acesso em: 9 nov. 2023.
dc.identifier.doi10.1016/j.jlumin.2020.117554
dc.identifier.issn0022-2313
dc.identifier.issne- 1872-7883
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0022231320309066
dc.language.isoeng
dc.publisher.countryHolanda
dc.publisher.departmentInstituto de FĂ­sica - IF (RMG)
dc.rightsAcesso Restrito
dc.subjectYb3+/Ho3+/Tm3+ co-doping
dc.subjectY4Al2O9 monoclinic phase
dc.subjectNanophosphors
dc.subjectStructural properties
dc.subjectPhotoluminescence emissions
dc.titleSynthesis and visible down- and up-conversion emissions from Yb3+/Ho3+/ Tm3+ Co-Doped Y4Al2O9 (YAM) nanocrystalline particles
dc.typeArtigo

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